A total hip implant system comprising: a prosthetic femoral component having a head with a part-spherical bearing surface； and a dual mobility acetabular cup system comprising a first bearing component made of ultra high molecular weight polyethylene mounted on the head, the first bearing component having a part-spherical inner bearing surface rotatably engaging the part-spherical bearing surface of the head, and having a part-spherical outer bearing surface, a second bearing component made of polyetheretherketone (PEEK) having an inner part-spherical bearing surface rotatably engaging the part-spherical outer bearing surface of the first bearing surface.
